JPH0314940Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to an electric motor for a fan or the like.

2. Description of the Related Art Compact motor fans have recently been widely used for cooling industrial products such as small computers and home appliances such as electromagnetic cookers. Although small-sized motor fans are formed with a simple structure using a brushless motor, price competition is becoming more intense as demand increases.

Problems that the invention aims to solve However, although conventional small motor fans have become brushless motors and have become smaller with a simpler structure, the stator is constructed by winding a coil around a laminated iron core, and the required A special mounting frame or the like was provided to secure it to the fixed part.

Therefore, manufacturing is time-consuming, and there is a certain limit to further miniaturization, and there is also a limit to reduction in price.

Means for Solving the Problems In an electric motor in which a movable element 3 is rotatably disposed on a stator 2, the stator 2 has coil winding parts 6 radially arranged around the circumference of a disc-shaped stator central member 5. At the same time, the coil winding portions 6 are formed by joining the auxiliary stator material 11, and a plurality of coil winding portions 6 are integrally protruded from the stator central member 5 toward the side circumference in an axially symmetrical manner with a predetermined width. , its end is bent perpendicularly to the circumferential surface of the mover 3 to form an arc-shaped magnetic pole part 8, and a drive coil 9 is inserted into the radial straight part. The auxiliary stator material 11 is overlapped and joined to the stator center member 5 of the stator 2, and mounting legs 10 of a predetermined width for fixing the electric motor are attached to the side periphery of the auxiliary stator material 11. It is characterized by its protrusion towards the direction.

Example The present invention will be explained below based on examples.

FIG. 1 and subsequent figures show an embodiment in which the present invention is implemented in a motor fan. The motor fan 1 is of the so-called outer rotor type, in which the stator 2 is arranged inside and the mover 3 is arranged outside, as shown in Fig. 1, and the fan 4 is integrally attached to the mover 3. It can be worn to ventilate or blow air freely. Stator 2
As shown in FIG. 2, coil winding parts 6 are provided radially outwardly at 90 degree intervals on the side periphery of the stator central member 5, which is a thin disk-shaped plate, and the ends thereof are 1
As shown in FIG.
A slightly wide arc-shaped magnetic pole part 8 is formed, and a required number of drive coils 9 are wound around the coil winding part 6, so that the movable element 3 can be rotationally driven. In addition, as shown in the figure, the disc-shaped central part of the stator central member 5 has approximately the same shape as the stator central member 5, and an elongated mounting leg 10 is provided on the side circumferential part toward the outside. Auxiliary stator plates 11 integrally protruding radially are closely joined together by caulking, welding, or the like. The mounting legs 10 of the auxiliary stator material 11 are
It is located between each coil winding part 6, and its middle part is bent in the opposite direction to the magnetic pole part 8 as shown in the figure, and a fixing hole 12 is opened in the tip part, as shown in FIG. The motor fan 1 can be fixed to a required fixing portion 13 through a fixing hole 12 using a fixing tool (not shown). Moreover, in the center of the stator central member 5,
As shown in FIGS. 1 and 2, the stator center member 5 is made into a cylindrical shaft support 14 which is punched out, and the movable element 3 is made of a cylindrical magnet material 15 provided around the circumference which is magnetized in a predetermined manner such as a sinusoidal curve. A rotary shaft portion 16 attached to the center of the motor fan 1 is fitted onto the shaft support 12 and fixed by caulking, welding, or the like. and,
A position detector 17 such as an IC Hall element is connected to the first
As shown in FIG.
The rotational position of the movable element 3 can be freely detected, and the rotation of the fan 4 can be controlled via a known motor control circuit. Reference numeral 19 denotes a back cover that can be fitted onto and removed from the second part of the stator.

Function However, when manufacturing the motor fan 1 having the above configuration, each thin plate is punched out and a second
As shown in the figure, the stator central member 5 and the auxiliary stator member 11 are formed by bending them into the above-mentioned required shapes, and the required drive coil 9 is wound around the coil winding portion 6 of the stator central member 5. By joining the auxiliary stator material 11 and attaching the position detector 17, the stator 2 is completed. In this way, the stator can be significantly lighter in weight than conventional laminated cores, and can be stamped integrally, thereby reducing manufacturing man-hours. In addition, because the auxiliary stator material is bonded, even though the stator is formed in a plate shape, it can prevent magnetic force saturation and generate the required magnetic force even if it has a small diameter shape. It is. The rotary shaft portion 16 fixed to the center of the movable element 3, which is integrally attached to the fan 4, is fitted onto the shaft support 14 of the stator 2 formed in this way and fixed by caulking, welding, etc. Once the lid 19 is fitted, the motor fan 1 is completed as shown in FIG. This motor fan can be easily attached to the required fixed part by means of mounting legs that integrally protrude from the auxiliary stator material that prevents magnetic saturation. There is no need to attach a frame or the like, and the structure can be extremely simplified, and it can also be made thinner and smaller, thereby reducing the cost.

Additionally, the rotational position of the mover can be detected by attaching a position detector such as an IC Hall element to the mounting leg that integrally protrudes from the auxiliary stator material of the stator in close proximity to the magnet material of the mover. As a result, the position can be detected without attaching the position detector through a special member as in the past, and the notch provided at one end of the magnetic pole part prevents the so-called death of the mover. It is also possible to eliminate point problems and drive the mover smoothly.

Other Embodiments FIG. 3 shows another embodiment of the stator 2 of the present invention. The magnetic pole part 8 of the stator central member 5 is provided with a notch (7) cut out in the direction opposite to that of the above embodiment, and an auxiliary stator member having an integrally provided mounting leg 10 is provided. 11 is also provided with a coil winding part 6 and a magnetic pole part 8 in the same manner as the stator central member 5, and a drive coil 9 is wound and attached to the coil winding part 6 where both are joined. It is something that exists.

In this embodiment, the stator center member and the auxiliary stator can sufficiently generate the required magnetic force to control the rotation of the mover, and the mounting legs can be attached to the required fixed part in the same manner as above. It can be easily fixed.

Note that the cutout portion can be cut out in a desired shape such as a straight line or a curved line as in the first and second embodiments to eliminate the dead center.

Still Other Embodiments FIG. 4 shows still another embodiment of the present invention.
In this embodiment, the mounting legs 10 of the auxiliary stator material 11 are provided in diagonal directions at required angles with respect to the radial direction (it is also possible to twist them if necessary), and
Mounting leg 1 with one end of each magnetic pole part 8 being oblique
It is notched and bent along the zero point to eliminate the dead center of the movable element drive.

In this embodiment, when the fan rotates, the oblique mounting legs reduce the noise of the fan as is known in the art, and at the same time the mounting legs are punched diagonally, one end of the magnetic pole part becomes oblique, eliminating the dead center. Notches can be formed and the material can be cut effectively.

In the above embodiment, the coil winding part and the magnetic pole part are integrally punched out in the stator central member, but separate pieces may be joined and the coil inserted therein, or a pair of magnetic pole parts The stator may be formed such that the stator central members provided with the stator central members face each other, and the magnetic pole portions of the stator central members are adjacent to each other, and the magnetic pole portions are further bent into a U-shape. , it can also be applied to a structure in which the movers are disposed axially opposite each other.

In addition, in order to improve the strength of the mounting legs in the above embodiments, ribs may be provided protruding or recessed along the mounting legs as appropriate, and the stator center member, auxiliary stator If the material or back cover is made of a metal printed circuit board and the required printed circuit structure is provided in the central circular part, etc., the central part of the stator and the printed circuit member can be shared, and the members, etc. This will result in a reduction in

Furthermore, in the above embodiments, a brushless motor with an outer rotor has been described, but it can also be applied to one with an inner rotor, and the magnetic poles are not limited to the four poles shown in the figure, but can be two or six poles.
The electric motor may be used not only for cooling and heating fans, but also for pumps and other applicable applications.

Effects of the invention As described above, the present invention can significantly reduce manufacturing man-hours, is lightweight, thin, and compact, and prevents magnetic saturation of the stator without using a fixing frame or the like. It can be easily fixed to a required fixing part using mounting legs protruding from the auxiliary stator material, and the cost can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of one embodiment of the present invention, Fig. 2 is a perspective view of the stator portion of the above, Fig. 3 is a perspective view of another embodiment of the stator of the same, and Fig. 4 is the same as the above. FIG. 7 is a perspective view of still another embodiment of the invention. 1... Motor fan, 2... Stator, 3... Mover, 4... Fan, 5... Stator central member, 6
...Coil winding part, 7...Magnetic pole part, 9...Drive coil, 10...Mounting leg, 11...Auxiliary stator material.

Claims (1)

[Claims for Utility Model Registration] In an electric motor in which a movable element 3 is rotatably disposed on a stator 2, the stator 2 has a disc-shaped stator center member 5 with coil winding parts 6 arranged radially around the periphery thereof. At the same time, the coil winding portions 6 are formed by joining the auxiliary stator material 11, and a plurality of coil winding portions 6 are integrally protruded from the stator central member 5 toward the side circumference in an axially symmetrical manner with a predetermined width. ,
The end portion is bent perpendicularly to the circumferential surface of the movable element 3 to form an arc-shaped magnetic pole portion 8, and a drive coil 9 is inserted into the radial straight portion. The auxiliary stator material 11 is overlapped and joined to the stator center member 5 of the stator 2, and mounting legs 10 of a predetermined width for fixing the electric motor are provided on the side periphery of the auxiliary stator material 11. An electric motor characterized by protruding toward the direction of the motor.